This is the stocking tunnel, where the raw materials for Sloss Furnaces were input to the system. Iron ore, limestone and coke were dropped down the shoots into the weighing car. Water ran through the tunnel all the time.
This is one of the haunted areas of sloss. People have reported hearing footsteps running after them (hence "Stalking Tunnel"), and folks also claim to have been hit in the face by an unseen being. I don't know about all that but it's an eire place.
Listed on National Register of Historic Places #72000162.